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  1. /*
  2.  * Header file for hardcoded AAC cube-root table
  3.  *
  4.  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_CBRT_TABLEGEN_H
  24. #define AVCODEC_CBRT_TABLEGEN_H
  25.  
  26. #include <stdint.h>
  27. #include <math.h>
  28. #include "libavutil/attributes.h"
  29. #include "libavcodec/aac_defines.h"
  30.  
  31. #if USE_FIXED
  32. #define CBRT(x) (int)floor((x).f * 8192 + 0.5)
  33. #else
  34. #define CBRT(x) x.i
  35. #endif
  36.  
  37. #if CONFIG_HARDCODED_TABLES
  38. #if USE_FIXED
  39. #define cbrt_tableinit_fixed()
  40. #include "libavcodec/cbrt_fixed_tables.h"
  41. #else
  42. #define cbrt_tableinit()
  43. #include "libavcodec/cbrt_tables.h"
  44. #endif
  45. #else
  46. static uint32_t cbrt_tab[1 << 13];
  47.  
  48. static av_cold void AAC_RENAME(cbrt_tableinit)(void)
  49. {
  50.     if (!cbrt_tab[(1<<13) - 1]) {
  51.         int i;
  52.         /* cbrtf() isn't available on all systems, so we use powf(). */
  53.         for (i = 0; i < 1<<13; i++) {
  54.             union {
  55.                 float f;
  56.                 uint32_t i;
  57.             } f;
  58.             f.f = pow(i, 1.0 / 3.0) * i;
  59.             cbrt_tab[i] = CBRT(f);
  60.         }
  61.     }
  62. }
  63. #endif /* CONFIG_HARDCODED_TABLES */
  64.  
  65. #endif /* AVCODEC_CBRT_TABLEGEN_H */
  66.